Wiper blade having secure means for locking to a drive arm, and wiper assembly having such a wiper blade

A wiper blade (12) is disclosed having a support connector (18) for at least one wiper rubber (14), an adapter (20) that is able to take a front-end terminal part (10) of a drive arm of the wiper blade (12) which is mounted so as to be articulated with respect to the connector (18), about an articulation axis (A), between a working position and a maintenance position, and which has a locking member (32) for locking said terminal part (10) to the adapter (20), which is mounted so as to be movable between a locking position and a retracted position releasing said terminal part (10). The wiper blade (12) has a member (68, 38) for immobilizing the locking member (32) in the locking position when the adapter (20) is in the working position, and for releasing the locking member (32) when the adapter (20) is in the maintenance position.